PASCO ME-8930 - Manuals

Smart Timer 012–06734A 2 In One Gate Mode, a single photogate lets you measure the time, velocity, or acceleration of a fence as it passes through the photogate. Two photogates are used for collision experiments using one or two carts or for experiments where the velocity of a cart must be measured ...

012–06734A Smart Timer 3 Plane4 Equipment Included: Smart Timer Smart Timer Picket Fences (2) 9 VDC adapter liquid crystal display touchpad keys mode illustrations on/off switch(side panel) battery compartment(bottom panel) input channel 2 input channel 1 connector for 9VDC adapter(side panel)) 9 VD...

Smart Timer 012–06734A 4 Pla ne4 Operating the Smart Timer 1. Plug the ¼-inch phone plug from the photogate into the Smart Timer’s input channel 1 or 2 (see Figure 2). For all experiments using a single photogate or pulley, either of the two available jacks may be used interchangeably. For all other...

Smart Timer 012–06734A 6 summary of the mode suggested for a given experimental activity can be found on page 5 (Quick Cross-Reference for Suggested Activities and Smart Timer Modes). Refer to the timing diagrams in Table 1 (pages 8 and 9) for a detailed look at how the Smart Timers times events on ...

012–06734A Smart Timer 7 cleared and the “*” reappears. This RESET-START-STOP sequence is repeated for each new elapsed time. Whenever the “*” is not showing, the mode may be changed. Using the Alternate Timing Function: Connect an appropriate accessory to input channel #1 or #2. Enter Stopwatch mod...

One Gate Fence Two Gates Pendulum Stop Watch One Gate (cm/s) Collision (cm/s) Pulley (rad/s) Pulley (rev/s) Table 1. Summary of Smart Timer Modes Time Speed Type Modes Key Sequence* Timing Diagram** Calculation Algorithm

One Gate Linear Pulley Angular Pulley Two Gates 30 seconds 60 seconds 5 minutes Manual One Gate Acceler a tion Counts Te st * The key sequences show n are valid in the initial or power-on  situation only.

Smart Timer 012–06734A 10 Pulley (rad/s): The Smart Timer will measure the speed of a pulley passing through a photogate in units of radians/second. One measurement will be taken each time the Start/ Stop switch is pressed. The Smart Timer cannot differentiate between clockwise and counterclockwise ...

012–06734A Smart Timer 11 timing interval. If you wish to stop the count during a timing interval, press Start/ Stop. The display will freeze the current count and the “*” will disappear from the first column. At this time you may select a new measurement or start a new timing interval. The maximum ...

Smart Timer 012–06734A 12 Caring for the Smart Timer • Do not use a pointed object (such as a pen) to press the keypad buttons. Wrap the Smart Timer separately when transporting it with other items. The transparent covering over the keypad can be creased by a fingernail or other sharp object. • Clea...

012–06734A Smart Timer 15 Experiment One: Acceleration Due to Gravity EQUIPMENT AND MATERIALS REQUIRED • Smart Timer (ME-8930) • Smart Timer Picket Fence • Photogate (ME-9498A) Purpose The purpose is to determine the acceleration due to the Earth’s gravity. Theory The accepted value for the accelera...

Smart Timer 012–06734A 16 Questions 1. How do the two methods for determining the acceleration on a body due to Earth’s gravity compare? 2. How do the experimental measurements compare to accepted values? 2. Insert the plug of the photogate into channel 1 or 2 of the Smart Timer, and set up the Smar...

012–06734A Smart Timer 17 Experiment Two: Newton’s Second Law EQUIPMENT AND MATERIALS REQUIRED • Smart Timer (ME-8930) • Photogate (ME-9498A) • Dynamics Cart (ME-9430 or ME-9454) • Photogate Bracket (part no. 003-04662) • Dynamics Cart Track (ME-9429A) • Mass Hanger and Mass Set (ME-9348) • 500 gram...

Smart Timer 012–06734A 18 5. Place the Dynamics Cart on the track, attach a string to the hole in the end of the cart, and tie a mass hanger on the other end of the string. The string must be just long enough so the cart hits the end stop before the mass hanger reaches the floor. 6. Pull the cart ba...

012–06734A Smart Timer 19 Experiment Three: Conservation of Momentum In Collisions EQUIPMENT AND MATERIALS REQUIRED • Smart Timer (ME-8930) • (2) Photogate (ME-9498A) • Collision Cart with mass (2) (ME-9454) • (2) Photogate Bracket (Part No. 003-04662) • Dynamics Cart Track (ME-9429A) • (2) Smart Ti...

Smart Timer 012–06734A 20 3. Set up the Smart Timer to measure Speed: collision (cm/s). Press to activate the Smart Timer. ➤ Note: If the flags of both carts do not go through the photogate beams twice, the Smart Timer will not complete the timing cycle and display velocitiesautomatically. You will ...

012–06734A Smart Timer 21 Analysis 1. For each of the cases, calculate the momentum of each cart before the collision. Record the results in Table 3.2. 2. For each of the cases, calculate the total momentum of both carts before the collision. Record the results in Table 3.2. 3. For each of the cases...

Smart Timer 012–06734A 22 Part B—Elastic Collisions Set up the carts so the magnetic ends face each other, so the carts will repel each other when they collide. Record the data in Tables 3.3 and 3.4. Equal Masses a. Place one cart at rest in the middle of the track. Give the other cart an initial ve...

012–06734A Smart Timer 25 Experiment Four: Rotational Inertia of a Disk and Ring EQUIPMENT REQUIRED • Rotating Platform (ME-8951) • Ohaus Triple-Beam Balance (DE-8707) or similar • Rotational Inertia Accessory (ME-8953) • paper clips (for masses < 1 g) • Smart Pulley (ME-9387) • calipers • Smart ...

Smart Timer 012–06734A 26 I = τ α To find the rotational inertia experimentally, a known torque is applied to the object and the resulting angular acceleration is measured. Since t = I a , where a is the angular acceleration, which is equal to a/r, and t is the torque caused by the weight hanging fr...

012–06734A Smart Timer 27 Mass of Ring Mass of Disk Inner Radius of Ring Outer Radius of Ring Radius of Disk Table 4.1. Theoretical Rotational Inertia Data Accounting for Friction 1. Set up the Smart Timer to measure Speed, Pulley (rev/s). 2. Tie several paper clips onto the string that hangs over t...

Smart Timer 012–06734A 28 least three times and record the average values for weight of the hanging mass and acceleration in Table 4.2. 3. Using calipers, measure the diameter of the pulley about which the thread is wrapped and calculate the radius. 4. Since in step 2, the disk is rotating as well a...

012–06734A Smart Timer 29 Calculations Record the results of the following calculations in Table 4.3. 1. Subtract the “friction mass” from the hanging mass used to accelerate the apparatus to determine the mass, m, to be used in the equations. 2. Calculate the experimental value of the rotational in...

012–06734A Smart Timer 31 • Simple Harmonic Oscillator (Experiment 3): Use a Photogate and the Smart Timer instead of a stop watch, and use the ME-9471 Picket Fence (part number 648-04704) , not the Smart Timer Picket Fence (Figure 6.1). Set up the Smart Timer to measure Time, Pendulum. Press to act...

012–06734A Smart Timer 33 Note: The following experiment is in copy-ready form in the manual for theTime of Flight Accessory (manual number 012-05088) • Time of Flight and Initial Velocity ( Experiment 1): Use the Smart Timer instead of a Photogate Timer, and set the Smart Timer to measure Time, Two...

Smart Timer 012–06734A 34 • Counting radiation with the G-M Tube/Power Supply (SN-7927) Insert the plug of the G-M Tube/ Power Supply into channel 1 or 2 of the Smart Timer (Figure 11.1) Set up the Smart Timer to measure Counts, 30 seconds, 60 seconds, 5 minutes, or Manual. Press to activate the Sma...

012–06734A Smart Timer 35 Technical Support Feedback If you have any comments about the product or manual, please let us know. If you have any suggestions on alternate experiments or find a problem in the manual, please tell us. PASCO appreciates any customer feedback. Your input helps us evaluate a...